Cylinder sleeve and method of producing the same



July 14, 1931. v c. 1-1. SWARTZ 1,814,267

CYLINDER SLEEVE AND METHOD OF PRODUCING THE SAME Filed Sept. 20, 1929 J;gwm eww Patented July 14, 1931 UNITED. STATES PATENT o F cE CARL H.BWAB'IZ, Ol' FBEEPOB'I, ILLINOIS, ASSIGNOR '10 STOVER MANUFACTURING &

ENGINE 00., O! IBEEIPOB'I' ILLINOIS, A CORPORATION ILLINOIS CYLINDERSLEEVE AND METHOD OF PRODUCING THE SAME application fled September 20,1929. Serial 1%.. seam.

diameter of the rebored cylinder allowing .005 of an inch for a ress fitin the cylinder bore, the inside of t e sleeve being bored onl to suchan extent that sufficient stock wil be left for grinding. In pressingthe sleeve into place the cylinder block is first heated to operatintemperature and a mix-- ture of litharge an glycerin is spread on theoutside of the sleeve to facilitate entry thereof. It has been customaryto sell semi-finished sleeves, the outside diameter of which.

is about five sixteenths of an inch larger than the bore of the cylinderto be repaired and the inner diameter of which is a proximately onesixteenth of an inch smal er than said bore, the sleeve being ofsuflicient length to ermit cutting down to the length required.

eretofore these sleeves were cast open at both ends. The manufacturerhad no particular diflicult in turning such sleeves down to thesemi-finished size; a large lathe and chuck were used in that operation.But the repairman who purchases the sleeve usually has ve littleequipment and for that reason found 1t ver difiicult and inconvenient tochuck such s eeves for the final turning operation; he had to first turnup and insert a plug inone end and then accurately determine and drill acenter hole therein, or else it was necessary for him to make up acenter to fit the tail stock on the-lathe that would be large enough indiameter to fit the inside of the sleeve. In either event it tookconsiderable time and involved too much expense.

It is, therefore, the principal object of my invention to provide as anew article of manufacture a cylinder sleeve having a cross-bar in oneend thereof made integral with the sleeve, preferably by casting thesame therein. The manufacturer, at the time the sleeve is turned down tothe semi-finished size, drills the center hole in the cross-bar whilethe piece is still centered and this hole is arranged to be used by therepairman later when the sleeve is to be turned down to the finalfinished size. Thus, the re airman can usean ordinary engine lathe withthe usual chuck for the turning operation. The sleeve is procured readyto be mounted in the lathe. There is no necessity for the workman in thegarage or repair shop havin to turn u a plug to the desired size or100%; about to End a suitable plug, drive the plug into place and afterthe turning operation drive the plug out again; the use of plugs and thetime consum-.

mg operations attendant on their use is avoided. Moreover, there isnever any danger of the work running out of true by reason of they plughappening to work loose in the end of the sleeve, as was otherwise thecase; the cross-bar is integral with the sleeve and affords a positivecentering means. Furthermore, the cross-bar can be used as a place. for

engagement of a driver pin on the head stock if the sleeve is.mountedthat way, which, of course, was out of the question where a plug wasused. The fact that the sleeve has to be cut down to the desired lengthanyway after the same is turned down to the exact size desired makes itunnecessary for any extra work'being done to remove the cross-bar; that1 end of the sleeve where the cross-bar is provided can be cut ofi whenthe sleeve is cut down to the desired length.

The invention is illustrated in the accompanying drawings, wherein-Figure 1 is a view of the rough castin showing'the cross-bar cast in oneend thereo Fig. 2 is a similar view showing the semifinished sleeve asit is sold to the repairman;

Fig. 3 is a view showing one way the sleeve of Fig. 2 can be mounted ina lathe by the replairman for the final machining thereof, an

Fig. 4 is a view of the finished sleeve ready for entry in the cylinder.

.The same reference numerals are ap lied to corresponding partsthroughout the vlews.

In the production of a cylinder sleeve a hollow c lmdrical casting 5 isproduced with a fairly eavy cross-bar web, or lug 6 cast in one endthereof extending diametrically as shown. The rough casting then has acenter hole 7 located and drilled in the cross-bar 6, as indicated inFig. 2. The inside of the sleeve is bored, as indicated at 8, absolutelyconcentric with the center hole 7, and the outside thereof is turneddown, as indicated at 9, likewise absolutely concentric with the centerhole 7, as by mounting the casting in a lathe with the open end thereofchucked on the head stock and the other end received on the tail stockcenter. semi-finished sleeve is preferably made about five sixteenths ofan inch larger than the bore of the cylinder to be repaired, while theinside diameter is made about one sixteenth of an inch smaller than saidbore. The sleeve is long enough to permit cutting down to the len thdesired. Notice that the boring at 8 an the turning at 9 is done fromthe open end of the sleeve casting toward the barred end; this is withthe idea that the barred end may subsequently be cut off when the sleeveis cut down to the length desired.

The repairman buys the sleeve in the form shown in Fig. 2, that is, inthe semi-finished form. His first job in repairing a cracked or badlyscored cylinder isto bore the cylinder to approximately one quarter ofan inch larger in diameter, which makes it almost large enough toaccommodate the sleeve, which, as stated before, is usually about fivesixteenths of an inch larger in diameter than the bore of the cylinderto be repaired. The sleeve is then mounted on a lathe either between achuck 10 on the head stock and a center 11 on the tail stock, or betweena center on the head stock and a cone on the tail stock, which permits adriver pin to be used engaging the cross-bar, and is turned down to anoutside diameter of approximately the size of the rebored cylinder,about .005 of an inch being allowed for a press fit. The inside is boredonly to such an extent that sufficient stock will be left for grinding.Then, the sleeve is cut off to the length desired, as indicated by thedot and dash line wy in Fig. 3, thereby producing the finished sleeve 5shown in Fig. 4 which is ready to be pressed into the cylinder. Inpressing the sleeve into place the practice is to first heat thecylinder block to operating temperature whereupon the sleeve may beentered without much trouble, especially if a mixture of litharge andglycerin are spread on the outside thereof. After the sleeve is in placethe bore thereof, which is now the bore of the cylinder, can be round tosize.

It is believed the foregoing description makes it perfectly clear that acylinder sleeve made in accordance with my invention obviates severaltime consuming operations otherwise necessitated and means a greatsaving in expense. The repairman gets the semifinished sleeve ready toput in the lathe and does not have to lose time in making it ready aswas, otherwise the case.

The outside diameter of the be The invention is covered in the a pendedclaims in such a way as to embrace a 1 le 'timate modificationsandadaptations suc as will undoubtedly occur to others skilled in thisart, as a. result of my disclosure.

' I claim:

1. A new article of manufacture comprising an over-size cylinder sleeveadapted to be eventuall turned down to the pro er size for a press litin a cylinder bore, sai sleeve ing open at one end thereof and havin aweb in the other end thereof provided with a center hole.

2. A new article of manufacture comprising a cylinder sleeve adaptedwhen turned down to the proper outside diameter to have a press fit in acylinder bore, said sleeve bein open at one end thereof and having a wein the other end thereof rovided with a center hole, and said sleeve einfurthermore of sufiicient length to perm1t cutting off the webbed endthereof when cutting the' sleeve down to the length desired.

3. A new articleof manufacture comprising a cylinder sleeve adapted whenturned down to the proper outside diameter to have a press fit in acylinder bore, said sleeve having a lug cast integral therewithextending crosswise of the center of at least one end thereof and havingthe location of the center indicated thereon.

4.. A new article of manufacture comprising a cylinder sleeve adaptedwhen turned down to the proper outside diameter to have apress fit in acylinder bore, said sleeve having a part permanently mounted in a wasteportion of the sleeve in at least one end thereof and provided with acenter hole, the said portion being arranged to be cut off when thesleeve is to be inserted in the cylinder.

5. A new article of manufacture comprisin a cylinder sleeve in the formof a hollow cy indrical casting having a lug cast integral with one endthereof and extending substantially radially therein and having a centerhole provided therein. I

6. A new article of manufacture comprising a cylinder sleeve in the formof a hollow cylindrical casting having one end thereof left open andhaving a cross-bar cast integral therewith extending substantiallydiametrically of the other end thereof, the said cross-bar having acenter hole provided therein.

7. The method of producing a. cylinder sleeve comprising the followingsteps: first, formin a hollow cylindrical sleeve member by casting, withacross-bar cast in one end thereof; and second, holding the sleevemember centered and machining the same from the open end to apredetermined outside diameter and a predetermined bore and, while thesame is centered, drilling a center hole in the cross-bar.

8. The method of producing a cylinder sleeve comprising the followingsteps: first, forming a hollow cylindrical sleeve member by casting,with a cross-bar cast in one end thereof; second, holding the sleevemember centered and machinin the same a portion of the length thereofrom the open end to a, predetermined inside and outside diameter and,while the same is centered, drilling a.

center hole in the cross-bar for a subsequent turning operation that hasto be performed on the sleeve, and, finally, cutting the sleeve down toa desired length and thereby removing the barred end.v

n Witness of the foregoing I atfix my signature.

CARL H. SWARTZ.

